273.16K - Water Triple Point (Point at which it can exist in three major states)

-273DC = 0K

Note: When working in AQA Physics A, ALL thermal energy questions must be answered using the Absolute scale, though values of temperature will often be given in the Celcius scale.

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Internal Energy

Energy Transfer only occurs when;

One object does work on another
There is a temperature difference between the two objects. This happens by;ConductionsConvectionRadiation

Internal Energy is the measure of the measure of the molecular energy with relation to movement and position. It can change when;

Work is done on or by the object
During Energy Transfer

Thermal Energy is a measure of molecular energy due to temperature.

Temperature is not the only source for internal energy. A magnatised iron core has a higher internal energy than a non magnatised iron core. The internal energy of an object is the sum of the random distribution of the kinetic energy and potential energy of its molecules.